Question

What are comets ? Why are comets seen after many years ?

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Answer 1

Answer:

Long-period comets are set in motion towards the Sun from the Oort cloud by gravitational perturbations caused by passing stars and the galactic tide. Hyperbolic comets may pass once through the inner Solar System before being flung to interstellar space. The appearance of a comet is called an apparition.

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Answer 2

Explanation:

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